It's a blank (6,4)

I think it could be either:

Which length description are you looking for?:

6,4

10*

tabula rasa

'it's a blank' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for tabula rasa that I've seen before include "Like spreadsheet, perhaps" , "fresh start" .)

I've seen this clue in The New York Times.

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